Table 2: Summary statistics for daily number of COPD deaths, daily air pollutant concentrations and weather conditions in Guangzhou, China, 2007–2011.

From: The burden of COPD mortality due to ambient air pollution in Guangzhou, China

VariablesMean ± SDMinimumPercentileMaximum
25th50th75th
Daily COPD deaths6 ± 3045722
PM10 (μg/m3)72.6 ± 37.77.645.465.191.1295.8
SO2 (μg/m3)40.0 ± 27.42.420.034.352.6198.5
NO2 (μg/m3)60.7 ± 27.017.641.153.973.4213.3
Mean temperature (°C)22.5 ± 6.45.418.024.027.733.5
Mean humidity (%)71.8 ± 13.225.064.073.082.099.0
Mean pressure (hpa)10 077 ± 699 88710 02610 07210 13010 266